混入了矿物润滑油的制冷剂R134a,流经带有空化结构的微通道,发生了沸腾-空化耦合相变现象。无氧铜铜板上刻有长150 mm宽0.8 m深1 mm的微通道,微通道内置有长4 mm宽0.2mm的矩形空化结构。铜板上面覆盖有玻璃片。观察测量不同流量及不同加热量下通道内的流形及通道背面温度。实验结果表明：润滑油抑制了相变现象的发生,降低了换热效率;工作介质为混入润滑油的制冷剂时,通道背面温度远高于工作介质为纯净制冷剂时的通道背面温度。
R134a mixed with lubricating oil and pure R134a flow in micro-channel was experimentally investigated.The cavitation structure,a rectangular micro-orifice 0.2 mm wide and 4 mm long, entrenched in a micro-channel 0.8 mm wide and 1 mm deep and 150 mm long,which was engraved on an oxygen-free copper plate covered with quartz glass.Flow pattern is observed and the wall temperature along channel is measured on different mass flux and different heat flux.In the experiment,a phenomenon was observed that,to compare with pure R134a.lubricating oil inhibits the occurrence of phase transitions,and heat transfer efficiency is reduced.While the medium is mixed with the oil, temperature of the channel back wall is much higher than temperature while the medium is pure R134a.
参考文献
| [1] | Remi Revellin;John R. Thome .A theoretical model for the prediction of the critical heat flux in heated microchannels[J].International Journal of Heat and Mass Transfer,2008(5/6):1216-1225. |
| [2] | C. Y. Ji;Y. Y. Yan .A molecular dynamics simulation of liquid-vapour-solid system near triple-phase contact line of flow boiling in a microchannel[J].Applied thermal engineering: Design, processes, equipment, economics,2008(2-3):195-202. |
| [3] | Ali Kosar .A model to predict saturated critical heat flux in minichannels and microchannels[J].International Journal of Thermal Sciences,2009(2):261-270. |
| [4] | H. Y. Wu;Ping Cheng .Boiling instability in parallel silicon microchannels at different heat flux[J].International Journal of Heat and Mass Transfer,2004(17/18):3631-3641. |
| [5] | A. E. Bergles;S. G. Kandlikar .On the Nature of Critical Heat Flux in Microchannels[J].Journal of heat transfer: Transactions of the ASME,2005(1):101-107. |
| [6] | Revellin R;Haberschill P;Bonjour J;Thome JR .Conditions of liquid film dryout during saturated flow boiling in microchannels[J].Chemical Engineering Science,2008(24):5795-5801. |
| [7] | Brandon Schneider;Ali Kosar;Yoav Peles .Hydrodynamic cavitation and boiling in refrigerant (R-123) flow inside microchannels[J].International Journal of Heat and Mass Transfer,2007(13/14):2838-2854. |
| [8] | Ali Kosar;Chih-Jung Kuo;Yoav Peles .Boiling heat transfer in rectangular microchannels with reentrant cavities[J].International Journal of Heat and Mass Transfer,2005(23/24):4867-4886. |
| [9] | Yoav Peles;Ali Kosar;Chandan Mishra;Chih-Jung Kuo;Brandon Schneider .Forced convective heat transfer across a pin fin micro heat sink[J].International Journal of Heat and Mass Transfer,2005(17):3615-3627. |
| [10] | Ali Kosar;Yoav Peles .Convective flow of refrigerant (R-123) across a bank of micro pin fins[J].International Journal of Heat and Mass Transfer,2006(17/18):3142-3155. |
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